Lock-nut.



UNITED STATES PATENT OFFICE.

GEORGE S. DUNKLE AND MILLARD M. TA`WNEY, OF HARRISBURG, PENNSYLVANIA.

:BOCK-HUT.

specifiction of retters ratene Patented 001125, '1910.

Application filed Marek 23, 19.10. Serial No. 551,084.

fproride an improved lock nut, the primary aim of the invention being to provide a look nnt which may be applied to any ordinary I bolt..

A'fnrther object of the invention is to so' 4eonstrnct the loek nut that it may be manually removed from the bolt` when desired withont. destroying either the nut or the bolt.

In the aeconipanying dr-.u\'ings, Figure 1 is a perspeetive view of a look nut ernbodying the present invention. Fig. 2 is a ver-` tical sectional view therethrough. Fig; 3' is a perspective 4view of the locking tooth of the device.

ln the dra'wings, the lock nnt is indicated by the nnmeral Sand is formed with the usual bolt opening The nut is further for-med with a bore 7 which for the major portion of itsI length is threaded as at 8 and this bore opens into another bore Which is indieated by the numeral 9 and is rectangular. Further, the bore t) opens into the bolt opening (i and is gradually broadened from that end which opens into the bore 7, to'that end which opens into the bolt. opening (i. Axially, the two bores T and ll are in alinement and their axis is tangential to the bolt openingar (i and inaslnneh as the bore 9 is of less linlensions than the bore T, a, shoulder 10 iz-P formed atthe junction of the two bores and the function of this shoulder will presently be explaiued.

The element n'hieli lot-las the nut to the bolt is in the nature of a tooth which is inf' dieated by the nmneral ll, as elearljxY shown in Fig. 3 of the drawings. In cross section. this tooth is reetangular and at its lower end is bereled, as at 12, to atl'ord a l'iiting edge l3 at its extreniity. v

A't its end opposite its beveled end, the tooth is forlned With a head 14, the upper surface of Which is oonvex, as indicated by the nunieral 15, and as clearly shown in Fig. 2 of the drawings. The under side of the head is beveled, as at 16, so that that side of the said head which is located at the beveled side of'the tooth is thicker or 4higher than the diainetrioally opposite side.

This tooth is inserted into the bore 9 with its head resting within the bore 7 and upon the shoulder 10. It will be observed that the pointed end of the tooth projects to that end of the bore 9 which opens into the 'bolt Opening of the nut. Into the bore 7 there is threade-d a plug 17 the' outer end of which is beveled, as at 18, and the inner end of this plog is convex, as at lt), rnd when the said plug is threaded int'o the bore '47, this convex inner end comes into engagement with the convexsurface of the head 1-1 of the tooth in the monner illustrated in Fig., 2 of the drawings. It will be observed from inspection of the said figure of the drawing's that owing to the beveled under sideI of the head let, the head will normally rest only at its thicker portion upon the said shoulder 10 and its opposite portion will be slightly spaced from the said shoulder. "ith the parts in this position, the nut is throaded upon an ordinary bolt vand the ping li' is. then further threaded into the bore 7V 'nd will depress the thinner portion of the head 14:, thereby roeking the tooth and eausing its bitinfr edfve 13 to bite into the threads of the bo t whereby to prevent baekward' rotation of the said nut upon the. bolt. In order, however, that the nut ma)7 be renioved from the bolt when desired, an opening 20 is forined through the front of the nut and transeets the bore t) and a nail or other like element may be inserted in this opening whereby to restore the tooth to normal position and to disengage it from the threads of the bolt.

lV hat is elainied is:

l. A nut having a bore eoinmunicating with its boltopenmg, o tooth mounted in the bore to roek, and a plog titted in the bore and bearing against the said tooth, the said plog being adjustable. whereby to rock the tooth.

2. A nut having a shouldered bore communicating with its bolt Opening, a tooth fitted in the bore and havin a head resting partly upon the said shoul er, and a Phi f threaded into the bore and bearng a ains the head of the tooth, the said lugheing adapted to depress the head ang tooth.

In. testmony that We claim the foregoing rock the our own, We have heiteto afixed our sgnaturs 111 the presence of two wltnesses.

GEORGE s. DUNKLE. MILLARD M. TAWNEY.

Witnesses:

HARRY H. WALTON, SIMON PAGE. 

